Fixup refreshPreKeys and call it whenever a prekey is deleted

js/libtextsecure.js

@@ -39443,7 +39443,7 @@ window.textsecure.api = function () {
         refreshPreKeys: function() {
             return textsecure.api.getMyKeys().then(function(preKeyCount) {
                 if (preKeyCount < 10) {
-                    return generateKeys(100);
+                    return generateKeys(100).then(TextSecureServer.registerKeys);
                 }
             });
         }